Skip to main content
U.S. flag

An official website of the United States government

Calculating moisture content for 1000-hour timelag fuels in western Washington and western Oregon.

Author(s):

David V. Sandberg

Year:

1985

Publication type:

Research Paper (RP)

Primary Station(s):

Pacific Northwest Research Station

Source:

Res. Pap. PNW-RP-336. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Forest and Range Experiment Station. 16 p

Description

A predictive model is presented to calculate moisture content of 1000-hour timelag fuels in Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) and western hemlock (Tsuga heterophylla (Raf.) Sarg.) logging slash in western Washington and western Oregon. The model is a modification of the 1000-hour fuel moisture model of the National Fire-Danger Rating System and requires daily measurements of precipitation duration, maximum and minimum relative humidities, and maximum and minimum temperatures. Comparison of measured and calculated fuel moisture contents showed good agreement. The model allows managers to accurately calculate fuel moisture values from weather variables for fuel reduction estimates. Current fire-weather stations provide adequate weather data for satisfactory operation of the 1000-hour fuel moisture model.

Citation

Ottmar, Roger D.; Sandberg, David V. 1985. Calculating moisture content for 1000-hour timelag fuels in western Washington and western Oregon. Res. Pap. PNW-RP-336. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Forest and Range Experiment Station. 16 p

Cited

Publication Notes

  • We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
  • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
https://www.fs.usda.gov/treesearch/pubs/21474